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Issue 93, 2014
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Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

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Abstract

A coalescence influence of Au-loading followed by calcination at 800 °C led to a notable change in crystal-structure, morphology, phase composition and photocatalytic activity of titanate-nanostructures. After calcination at 800 °C, bare sodium titanate nanotubes (TNT) having a BET surface area (SBET) of 176 m2 g−1 is transformed into sodium titanate nanorods of SBET = 21 m2 g−1, whereas calcination of Au-loaded (Au+3, Au0 and Au-nanoparticle (AuNP)) TNT at 800 °C led to a variety of fragmented particles having different crystal structures, SBET (21–39 m2 g−1), shape and sizes (50–75 nm), attributed to strain induced thermal decomposition of TNT after Au-loading, and the oxidation state of Au is determined by XPS analysis. The comparative photocatalytic activity of these as-prepared catalysts to that of P25-TiO2 under UV-light were evaluated for the photooxidation of the insecticide imidacloprid which gradually degraded to various intermediate photoproducts and finally decomposed to CO2. The degradation of imidacloprid follows pseudo-first order kinetics, where 0.5 wt% Au0-deposited-TNT after calcination exhibits the highest photocatalytic activity (rate constant k = 8.9 × 10−3 min−1), which is comparatively explained on the basis of their crystal phase, surface-area, morphology and the relaxation time of photoexcited electron–hole pairs, as measured by time resolved spectroscopy.

Graphical abstract: Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

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Publication details

The article was received on 03 Jul 2014, accepted on 30 Sep 2014 and first published on 30 Sep 2014


Article type: Paper
DOI: 10.1039/C4RA06605G
Author version available: Download Author version (PDF)
Citation: RSC Adv., 2014,4, 51342-51348
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    Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

    I. S. Grover, S. Singh and B. Pal, RSC Adv., 2014, 4, 51342
    DOI: 10.1039/C4RA06605G

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